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Process for producing metal-containing castings, and associated apparatus

a technology of metal-containing castings and processing methods, applied in the field of material science and process engineering, can solve the problems of affecting the production of metallic glasses, and lowering the cooling speed, so as to achieve good mold filling and high cooling rate

Inactive Publication Date: 2011-08-23
INST FUER FESTKOERPER & WERKSTOFFORSCHUNG DRESDEN EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The present invention provides a method for producing metal-containing castings and associated apparatus, with which a good mold filling during casting without overheating a metal-containing melt is achieved in addition to high cooling rates.

Problems solved by technology

However, an increase in temperature also results in a higher quantity of heat to be removed, which leads to a lower cooling speed and therefore is not desirable.
It is furthermore known that contaminations of the melt with oxygen interfere with the producibility of metallic glasses and impair their properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028]A metal melt is produced from 100 g of a FeCPBSiMn alloy (cast iron with the addition of boron and phosphorus) in an induction furnace in argon atmosphere. A tungsten electrode extends into the metallic melt, which electrode is connected to a voltage source. A copper ingot mold is arranged under the induction furnace, which ingot mold contains recesses for shaping a cast washer. A washer is to be cast with the dimensions, internal diameter=18 mm, external diameter=26 mm, thickness=1 mm. The copper ingot mold is likewise connected to the voltage source in an electrically conductive manner. After application of the voltage of 230 V, the outlet in the induction furnace is opened. At the same time an argon overpressure of 200 kPa is applied. The metallic melt is thus pushed into the recess in the copper ingot mold and fills it completely due to the lower surface tension. After the cooling and opening of the copper ingot mold, a complete washer with the desired dimensions is obtain...

example 2

[0029]The alloy Fe65.5Cr4Mo4Ga4P12C5B5.5 cannot be cast amorphously to form a washer according to the methods of the prior art. According to the method according to claim 1, a complete washer can now be produced from this alloy, the product being available in an amorphous form.

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Abstract

Method such as can be used, for example, for producing molded articles from metallic glasses. Method and apparatus are provided in which a good mold filling during casting is achieved in addition to high cooling rates. The method includes introducing a metal-containing melt into an electrically conducting casting mold, the metal-containing melt and the mold being connected in an electrically conducting manner to the outputs of the same voltage source during the introduction into a casting mold, so that a preset current flows through the boundary interface between the melt and the mold. Apparatus is also provided in which there is an electrically conducting connection to a voltage source between a metal-containing melt and an electrically conducting mold for the melt.

Description

FIELD OF THE INVENTION[0001]The invention relates to the fields of materials sciences and process engineering and relates to a method for producing metal-containing castings, such as can be used, for example, for producing molded articles from metallic glasses, and an apparatus for implementing this method.BACKGROUND INFORMATION[0002]A metallic glass is a metastable alloy that does not have any long-range order, in contrast to normal crystalline materials. Its structure is amorphous and is similar to that of a liquid. Several conditions must be met in order to obtain the amorphous state during cooling. For instance, the nucleation and nucleus growth must be suppressed in order to freeze the structure of the liquid. In order to realize this, the metallic melt must be cooled very quickly, for example, through contact with the surface of a heat sink that conducts heat very well. The quality of the thermal contact and the thickness and heat conductivity of the liquid layer determine the...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B22D17/00B22D27/13B22D27/02
CPCB22D17/00B22D27/02B22D17/007C22C45/00B22D17/30
Inventor ROTH, STEFANSCHULTZ, LUDWIG
Owner INST FUER FESTKOERPER & WERKSTOFFORSCHUNG DRESDEN EV